More exit code check specs

spec/exit_codes/minimum_coverage_by_file_check_spec.rb

@@ -17,16 +17,12 @@
   context "all files passing requirements" do
     let(:minimum_coverage_by_file) { {line: 80} }
 
-    it "passes" do
-      expect(subject).not_to be_failing
-    end
+    it { is_expected.not_to be_failing }
   end
 
   context "one file violating requirements" do
     let(:minimum_coverage_by_file) { {line: 90} }
 
-    it "fails" do
-      expect(subject).to be_failing
-    end
+    it { is_expected.to be_failing }
   end
 end

spec/exit_codes/minimum_overall_coverage_check_spec.rb

@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+require "helper"
+
+RSpec.describe SimpleCov::ExitCodes::MinimumOverallCoverageCheck do
+  let(:result) do
+    instance_double(SimpleCov::Result, coverage_statistics: stats)
+  end
+  let(:stats) do
+    {
+      line: SimpleCov::CoverageStatistics.new(covered: 8, missed: 2),
+      branch: SimpleCov::CoverageStatistics.new(covered: 8, missed: 2)
+    }
+  end
+
+  subject { described_class.new(result, minimum_coverage) }
+
+  context "everything exactly ok" do
+    let(:minimum_coverage) { {line: 80.0} }
+
+    it { is_expected.not_to be_failing }
+  end
+
+  context "coverage violated" do
+    let(:minimum_coverage) { {line: 90.0} }
+
+    it { is_expected.to be_failing }
+  end
+
+  context "coverage slightly violated" do
+    let(:minimum_coverage) { {line: 80.01} }
+
+    it { is_expected.to be_failing }
+  end
+
+  context "one criterion violated" do
+    let(:minimum_coverage) { {line: 80.0, branch: 90.0} }
+
+    it { is_expected.to be_failing }
+  end
+end